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WAEC Further Mathematics 2006 Question 22

Question 22

Dynamics

A particle of mass 2.5 kg is moving at a speed of 12 ms−1. If a force of magnitude 10 N acts against it, find how long it takes to come to rest.

  1. A.1.5s
  2. B.3.0s
  3. C.4.0s
  4. D.6.0s
Show the answer and explanation

Answer: B (3.0s)

Explanation

The retardation is F/m = 10/2.5 = 4 ms⁻². Time to stop = 12 ÷ 4 = 3 s.